html, body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    height: 100%; /* Full height of the viewport */
    overflow: hidden; /* Prevent scrolling on the whole window */
    color: rgba(255, 255, 255, 0.9); /* Default 90% white for all text */
    box-sizing: border-box; /* Include borders and padding in dimensions */
}

header {
    height: 80px; /* Fixed header height */
    width: 100%;
    background-color: #4B4B4B; /* Darker Gray */
    color: rgba(255, 255, 255, 0.9); /* 90% white for header text */
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box; /* Include padding and borders */
}

footer {
    height: 80px; /* Fixed footer height */
    width: 100%;
    background-color: #2F4F4F; /* Darkest Gray */
    color: rgba(255, 255, 255, 0.9); /* 90% white for footer text */
    font-size: 10px; /* Very small footer font size */
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box; /* Include padding and borders */
}

.container {
    display: flex;
    height: calc(100% - 160px); /* Total height minus header and footer */
    overflow: hidden; /* Prevent scrolling on the container */
    width: 100%; /* Ensure container stretches full width */
    box-sizing: border-box; /* Include padding and borders */
}

.left-panel {
    width: 200px; /* Fixed left panel width */
    background-color: #555555; /* Medium Dark Gray */
    color: rgba(255, 255, 255, 0.9); /* 90% white for left panel text */
    overflow-y: auto; /* Allow vertical scrolling */
    overflow-x: hidden; /* Prevent horizontal scrolling */
    padding: 10px;
    box-sizing: border-box; /* Include padding in size */
    border: none; /* Remove any borders */
    outline: none; /* Remove any outlines */    
}

.right-panel {
    flex: 1; /* Take remaining width */
    background-color: #3A3D48; /* Updated background color */
    color: rgba(255, 255, 255, 0.9); /* Ensure 90% white for right panel text */
    overflow-y: auto; /* Allow vertical scrolling */
    overflow-x: hidden; /* Prevent horizontal scrolling */
    padding: 0px;
    box-sizing: border-box; /* Include padding in size */
}

ul {
    margin: 10px 0; /* Space above and below the list */
    padding-left: 25px; /* Slightly indent the list items */
    line-height: 1.6; /* Consistent spacing between list lines */
}

li {
    margin-bottom: 10px; /* Space between list items */
}

ul ul {
    margin: 5px 0; /* Reduced margin for nested lists */
    padding-left: 20px; /* Smaller indentation for nested lists */
}

li ul li {
    margin-bottom: 5px; /* Smaller spacing for nested list items */
}

/* Scrollbar-specific fix for Firefox and consistent scrollbar look */
.left-panel, .right-panel {
    scrollbar-width: thin; /* Firefox-specific: thinner scrollbars */
    scrollbar-color: #4B4B4B #2F4F4F; /* Scrollbar thumb and track colors */
}

/* Link styles */
a {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.9); /* 90% white for links */
    display: block;
    margin-bottom: 10px;
    padding: 5px; /* Add padding for better click area */
    transition: background-color 0.3s ease; /* Smooth transition for hover */
}

a:hover {
    color: rgba(255, 255, 255, 1); /* 100% white on hover */
}